User`s manual

AW00098504000 Image Acquisition Control
Basler ace Camera Link 75
7.2.5 Using a Hardware Acquisition Start Trigger
Signal
7.2.5.1 Introduction
If the Trigger Mode parameter for the acquisition start trigger is set to on and the Trigger Source
parameter is set to line 1, CC1, CC2, or CC3, an externally generated electrical signal injected into
the selected source will be will act as the acquisition start trigger signal for the camera. This type of
trigger signal is generally referred to as a hardware trigger signal or as an external acquisition start
trigger signal (ExASTrig).
If the Trigger Source is set to line 1, the GPIO line must be properly set to operate as an input in
order to accept the trigger signal.
A rising edge or a falling edge of the ExASTrig signal can be used to trigger acquisition start. The
Trigger Activation parameter is used to select rising edge or falling edge triggering.
When the Trigger Mode parameter is set to on, the camera will initially be in a "waiting for acquisition
start trigger" acquisition status. It cannot react to frame start trigger signals when in this acquisition
status. When the appropriate ExASTrig signal is applied to the selected source (e.g, a rising edge
of the signal for rising edge triggering), the camera will exit the "waiting for acquisition start trigger"
acquisition status and will enter the "waiting for frame start trigger" acquisition status. It can then
react to frame start trigger signals. When the number of frame start trigger signals received by the
camera is equal to the current Acquisition Frame Count parameter setting, the camera will return to
the "waiting for acquisition start trigger" acquisition status. When a new ExASTrig signal is applied
to the selected source, the camera will again exit from the "waiting for acquisition start trigger"
acquisition status and enter the "waiting for frame start trigger" acquisition status.
For more information about setting the camera for hardware acquisition start triggering and
selecting the source to receive the ExASTrig signal, see Section 7.2.5.3 on page 76.
For more information about the electrical requirements for the GPIO line when it is set to operate
as an input, see Section 5.7.2 on page 35.
For more information about CC1, CC2, and CC3, see Section 6.1 on page 49.
7.2.5.2 Acquisition Start Trigger Delay
The acquisition start trigger delay feature lets you specify a delay (in microseconds) that will be
applied between the receipt of each hardware acquisition start trigger signal by the camera and
when the trigger signal will become effective.
The acquisition start trigger delay may be specified in the range from 0 to 10000000 µs (equivalent
to 10 s). When the delay is set to 0 µs, no delay will be applied.
If you are parameterizing the camera with Basler pylon, the Trigger Delay Abs parameter will
determine the length of the delay.
If you are parameterizing the camera via direct register access, the Trigger Delay Raw Acquisition
Start register will determine the length of the delay.